import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 * @author gh
 * @create 2021-07-26 19:36
 */
public class test {
    public static void main(String[] args) {
        List<Integer> list = new LinkedList<>();
        list.add(1);
        System.out.println(list.toString());
        Object o = new Object();
    }
}
